Quite substantial closures took place, including all but one line of the Belfast and County Down Railway. In 1958 the Great Northern Railway Board (GNR(I)), one of two remaining railways that crossed the border between the Republic of Ireland and Northern Ireland, was split between Córas Iompair Éireann (CIE, the Republic of Ireland's nationalised railway system) and the UTA. The UTA took over the GNR system in Northern Ireland, but by 1965 they had closed down more than half of it.